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United States Patent | 5,044,432 |
Cunningham ,   et al. | September 3, 1991 |
A well pipe hanger with a metal sealing annulus valve comprising an axially positionable annular metal seal element with a pair of radially spaced annular sealing surfaces that cooperate with annular metallic sealing surfaces on adjacent well elements to establish a metal-to-metal seal between said elements.
Inventors: | Cunningham; Christopher E. (Edinburgh, GB6); Ruesse; Rolf A. (Fife, GB6) |
Assignee: | FMC Corporation (Chicago, IL) |
Appl. No.: | 566009 |
Filed: | August 10, 1990 |
Current U.S. Class: | 166/319; 166/206; 285/123.3; 285/123.4 |
Intern'l Class: | E21B 033/04 |
Field of Search: | 166/86,84,206,208,316,332 285/133.2,137.2,140-142 |
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4324422 | Apr., 1982 | Rains et al. | 166/87. |
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4568062 | Feb., 1986 | Regitz et al. | 251/328. |
4697828 | Oct., 1987 | Chou | 285/141. |
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Foreign Patent Documents | |||
2214543 | Jun., 1989 | GB. |